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authorjohannst <johannst@users.noreply.github.com>2021-06-02 22:38:57 +0000
committerjohannst <johannst@users.noreply.github.com>2021-06-02 22:38:57 +0000
commitd2d2ba7c6602e73dc2e3dbd0aa4215e4c412a688 (patch)
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+<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `src/lib.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>lib.rs - source</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled ><script id="default-settings"></script><script src="../../storage.js"></script><script src="../../crates.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../../favicon.svg">
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+ <a id="settings-menu" href="../../settings.html"><img src="../../wheel.svg" width="18" height="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><pre class="line-numbers"><span id="1"> 1</span>
+<span id="2"> 2</span>
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+<span id="164">164</span>
+<span id="165">165</span>
+</pre><div class="example-wrap"><pre class="rust ">
+<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">convert</span>::{<span class="ident">AsMut</span>, <span class="ident">AsRef</span>};
+<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>;
+<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">ops</span>;
+<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">os</span>::<span class="ident">unix</span>::<span class="ident">io</span>::<span class="ident">AsRawFd</span>;
+
+<span class="kw">mod</span> <span class="ident">fmt</span>;
+<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">kvm</span>;
+<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">kvm_sys</span>;
+<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">vcpu</span>;
+<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">vm</span>;
+<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">x86_64</span>;
+
+<span class="doccomment">/// Strong type representing physical addresses.</span>
+<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">PhysAddr</span>(<span class="kw">pub</span> <span class="ident">u64</span>);
+
+<span class="doccomment">/// Helper to turn libc return values into an [io::Result](std::io::Result). Returns</span>
+<span class="doccomment">/// [`Error::last_os_error`](std::io::Error::last_os_error) if `ret &lt; 0`.</span>
+<span class="kw">fn</span> <span class="ident">libcret</span>(<span class="ident">ret</span>: <span class="ident">libc</span>::<span class="ident">c_int</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">libc</span>::<span class="ident">c_int</span><span class="op">&gt;</span> {
+ <span class="kw">if</span> <span class="ident">ret</span> <span class="op">&lt;</span> <span class="number">0</span> {
+ <span class="prelude-val">Err</span>(<span class="ident">io</span>::<span class="ident">Error</span>::<span class="ident">last_os_error</span>())
+ } <span class="kw">else</span> {
+ <span class="prelude-val">Ok</span>(<span class="ident">ret</span>)
+ }
+}
+
+<span class="doccomment">/// Wrapper of `libc::ioctl` for KVM ioctls with one argument and returning an</span>
+<span class="doccomment">/// [`io::Result`](std::io::Result).</span>
+<span class="kw">fn</span> <span class="ident">ioctl</span><span class="op">&lt;</span><span class="ident">F</span>: <span class="ident">AsRawFd</span><span class="op">&gt;</span>(<span class="ident">fd</span>: <span class="kw-2">&amp;</span><span class="ident">F</span>, <span class="ident">cmd</span>: <span class="ident">u64</span>, <span class="ident">arg</span>: <span class="ident">u64</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">libc</span>::<span class="ident">c_int</span><span class="op">&gt;</span> {
+ <span class="ident">libcret</span>(<span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">ioctl</span>(<span class="ident">fd</span>.<span class="ident">as_raw_fd</span>(), <span class="ident">cmd</span>, <span class="ident">arg</span>) })
+}
+
+<span class="doccomment">/// Wrapper to safely allocate memory for guest VMs.</span>
+<span class="doccomment">///</span>
+<span class="doccomment">/// The underlying memory is freed automatically once the `UserMem` instance is dropped.</span>
+<span class="doccomment">///</span>
+<span class="doccomment">/// Memory can be mapped into a guest VM with</span>
+<span class="doccomment">/// [`Vm::set_user_memory_region`](crate::vm::Vm::set_user_memory_region).</span>
+<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">UserMem</span> {
+ <span class="ident">ptr</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">u8</span>,
+ <span class="ident">len</span>: <span class="ident">usize</span>,
+}
+
+<span class="kw">impl</span> <span class="ident">UserMem</span> {
+ <span class="doccomment">/// Allocate a zero-initialized memory region of `len` bytes.</span>
+ <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">len</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">UserMem</span><span class="op">&gt;</span> {
+ <span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="kw">unsafe</span> {
+ <span class="ident">libc</span>::<span class="ident">mmap</span>(
+ <span class="ident">std</span>::<span class="ident">ptr</span>::<span class="ident">null_mut</span>(),
+ <span class="ident">len</span>,
+ <span class="ident">libc</span>::<span class="ident">PROT_READ</span> <span class="op">|</span> <span class="ident">libc</span>::<span class="ident">PROT_WRITE</span>,
+ <span class="ident">libc</span>::<span class="ident">MAP_PRIVATE</span> <span class="op">|</span> <span class="ident">libc</span>::<span class="ident">MAP_ANONYMOUS</span>,
+ <span class="op">-</span><span class="number">1</span>,
+ <span class="number">0</span>,
+ )
+ };
+
+ <span class="kw">if</span> <span class="ident">ptr</span> <span class="op">=</span><span class="op">=</span> <span class="ident">libc</span>::<span class="ident">MAP_FAILED</span> {
+ <span class="prelude-val">Err</span>(<span class="ident">io</span>::<span class="ident">Error</span>::<span class="ident">last_os_error</span>())
+ } <span class="kw">else</span> {
+ <span class="prelude-val">Ok</span>(<span class="ident">UserMem</span> {
+ <span class="ident">ptr</span>: <span class="ident">ptr</span>.<span class="ident">cast</span>(),
+ <span class="ident">len</span>,
+ })
+ }
+ }
+
+ <span class="doccomment">/// Allocate a zero-initialized memory region of `len` bytes and initialize the first bytes</span>
+ <span class="doccomment">/// with `init_from`.</span>
+ <span class="doccomment">///</span>
+ <span class="doccomment">/// # Panics</span>
+ <span class="doccomment">///</span>
+ <span class="doccomment">/// Panics if `init_from` is larger than the memory size `len`.</span>
+ <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">with_init</span>(<span class="ident">len</span>: <span class="ident">usize</span>, <span class="ident">init_from</span>: <span class="kw-2">&amp;</span>[<span class="ident">u8</span>]) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">UserMem</span><span class="op">&gt;</span> {
+ <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">len</span> <span class="op">&gt;</span><span class="op">=</span> <span class="ident">init_from</span>.<span class="ident">len</span>());
+
+ <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">m</span> <span class="op">=</span> <span class="ident">UserMem</span>::<span class="ident">new</span>(<span class="ident">len</span>)<span class="question-mark">?</span>;
+ <span class="ident">m</span>.<span class="ident">load</span>(<span class="ident">PhysAddr</span>(<span class="number">0</span>), <span class="ident">init_from</span>);
+ <span class="prelude-val">Ok</span>(<span class="ident">m</span>)
+ }
+
+ <span class="doccomment">/// Load the bytes stored in `data` into memory at physical address `addr`.</span>
+ <span class="doccomment">///</span>
+ <span class="doccomment">/// # Panics</span>
+ <span class="doccomment">///</span>
+ <span class="doccomment">/// Panics if `addr + data.len` is larger than the memory size `len`.</span>
+ <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">load</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">addr</span>: <span class="ident">PhysAddr</span>, <span class="ident">data</span>: <span class="kw-2">&amp;</span>[<span class="ident">u8</span>]) {
+ <span class="macro">assert</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">len</span> <span class="op">&gt;</span><span class="op">=</span> <span class="ident">addr</span>.<span class="number">0</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">+</span> <span class="ident">data</span>.<span class="ident">len</span>());
+
+ <span class="kw">let</span> <span class="ident">addr</span> <span class="op">=</span> <span class="ident">addr</span>.<span class="number">0</span> <span class="kw">as</span> <span class="ident">usize</span>;
+ <span class="self">self</span>.<span class="ident">as_mut</span>()[<span class="ident">addr</span>..<span class="ident">addr</span> <span class="op">+</span> <span class="ident">data</span>.<span class="ident">len</span>()].<span class="ident">copy_from_slice</span>(<span class="ident">data</span>);
+ }
+}
+
+<span class="kw">impl</span> <span class="ident">ops</span>::<span class="ident">Drop</span> <span class="kw">for</span> <span class="ident">UserMem</span> {
+ <span class="doccomment">/// Free underlying memory.</span>
+ <span class="kw">fn</span> <span class="ident">drop</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) {
+ <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">munmap</span>(<span class="self">self</span>.<span class="ident">ptr</span>.<span class="ident">cast</span>(), <span class="self">self</span>.<span class="ident">len</span>) };
+ }
+}
+
+<span class="kw">impl</span> <span class="ident">AsRef</span><span class="op">&lt;</span>[<span class="ident">u8</span>]<span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">UserMem</span> {
+ <span class="kw">fn</span> <span class="ident">as_ref</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="kw-2">&amp;</span>[<span class="ident">u8</span>] {
+ <span class="kw">unsafe</span> { <span class="ident">std</span>::<span class="ident">slice</span>::<span class="ident">from_raw_parts</span>(<span class="self">self</span>.<span class="ident">ptr</span>, <span class="self">self</span>.<span class="ident">len</span>) }
+ }
+}
+
+<span class="kw">impl</span> <span class="ident">AsMut</span><span class="op">&lt;</span>[<span class="ident">u8</span>]<span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">UserMem</span> {
+ <span class="kw">fn</span> <span class="ident">as_mut</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> [<span class="ident">u8</span>] {
+ <span class="kw">unsafe</span> { <span class="ident">std</span>::<span class="ident">slice</span>::<span class="ident">from_raw_parts_mut</span>(<span class="self">self</span>.<span class="ident">ptr</span>, <span class="self">self</span>.<span class="ident">len</span>) }
+ }
+}
+
+<span class="doccomment">/// Internal wrapper to automatically `mmap` and `munmap` the the [`struct kvm_run`][kvm_run]</span>
+<span class="doccomment">/// for a given VPCU.</span>
+<span class="doccomment">///</span>
+<span class="doccomment">/// [kvm_run]: https://www.kernel.org/doc/html/latest/virt/kvm/api.html#the-kvm-run-structure</span>
+<span class="kw">struct</span> <span class="ident">KvmRun</span> {
+ <span class="ident">ptr</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">kvm_sys</span>::<span class="ident">kvm_run</span>,
+ <span class="ident">len</span>: <span class="ident">usize</span>,
+}
+
+<span class="kw">impl</span> <span class="ident">KvmRun</span> {
+ <span class="doccomment">/// Mmap the `struct kvm_run` for a given `VCPU` referenced by the argument file descriptor</span>
+ <span class="doccomment">/// `vcpu`.</span>
+ <span class="kw">fn</span> <span class="ident">new</span><span class="op">&lt;</span><span class="ident">F</span>: <span class="ident">AsRawFd</span><span class="op">&gt;</span>(<span class="ident">vcpu</span>: <span class="kw-2">&amp;</span><span class="ident">F</span>, <span class="ident">len</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">KvmRun</span><span class="op">&gt;</span> {
+ <span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="kw">unsafe</span> {
+ <span class="ident">libc</span>::<span class="ident">mmap</span>(
+ <span class="ident">std</span>::<span class="ident">ptr</span>::<span class="ident">null_mut</span>(),
+ <span class="ident">len</span>,
+ <span class="ident">libc</span>::<span class="ident">PROT_READ</span> <span class="op">|</span> <span class="ident">libc</span>::<span class="ident">PROT_WRITE</span>,
+ <span class="ident">libc</span>::<span class="ident">MAP_SHARED</span>,
+ <span class="ident">vcpu</span>.<span class="ident">as_raw_fd</span>(),
+ <span class="number">0</span>,
+ )
+ };
+
+ <span class="kw">if</span> <span class="ident">ptr</span> <span class="op">=</span><span class="op">=</span> <span class="ident">libc</span>::<span class="ident">MAP_FAILED</span> {
+ <span class="prelude-val">Err</span>(<span class="ident">io</span>::<span class="ident">Error</span>::<span class="ident">last_os_error</span>())
+ } <span class="kw">else</span> {
+ <span class="prelude-val">Ok</span>(<span class="ident">KvmRun</span> {
+ <span class="ident">ptr</span>: <span class="ident">ptr</span>.<span class="ident">cast</span>(),
+ <span class="ident">len</span>,
+ })
+ }
+ }
+}
+
+<span class="kw">impl</span> <span class="ident">ops</span>::<span class="ident">Drop</span> <span class="kw">for</span> <span class="ident">KvmRun</span> {
+ <span class="doccomment">/// Munmap the mmaped `struct kvm_run`.</span>
+ <span class="kw">fn</span> <span class="ident">drop</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) {
+ <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">munmap</span>(<span class="self">self</span>.<span class="ident">ptr</span>.<span class="ident">cast</span>(), <span class="self">self</span>.<span class="ident">len</span>) };
+ }
+}
+
+<span class="kw">impl</span> <span class="ident">AsRef</span><span class="op">&lt;</span><span class="ident">kvm_sys</span>::<span class="ident">kvm_run</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">KvmRun</span> {
+ <span class="kw">fn</span> <span class="ident">as_ref</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="kw-2">&amp;</span><span class="ident">kvm_sys</span>::<span class="ident">kvm_run</span> {
+ <span class="kw">unsafe</span> { <span class="op">&amp;</span> <span class="kw-2">*</span>(<span class="self">self</span>.<span class="ident">ptr</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">kvm_sys</span>::<span class="ident">kvm_run</span>) }
+ }
+}
+
+<span class="kw">impl</span> <span class="ident">AsMut</span><span class="op">&lt;</span><span class="ident">kvm_sys</span>::<span class="ident">kvm_run</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">KvmRun</span> {
+ <span class="kw">fn</span> <span class="ident">as_mut</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">kvm_sys</span>::<span class="ident">kvm_run</span> {
+ <span class="kw">unsafe</span> { <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="kw-2">*</span>(<span class="self">self</span>.<span class="ident">ptr</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">kvm_sys</span>::<span class="ident">kvm_run</span>) }
+ }
+}
+</pre></div>
+</section><section id="search" class="content hidden"></section><section class="footer"></section><div id="rustdoc-vars" data-root-path="../../" data-current-crate="kvm_rs" data-search-js="../../search-index.js"></div>
+ <script src="../../main.js"></script><script src="../../source-script.js"></script><script src="../../source-files.js"></script></body></html> \ No newline at end of file
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